A stratified partially premixed low-pollution combustor with lean premixed main combustion stage

Abstract

The invention discloses a layered part premixing low-pollution combustor of main combustion level premixing and pre-evaporation. The layered part premixing low-pollution combustor has a pre-heating function. Fuel oil is divided into a main combustion level and an on-duty level. Diffusive combustion is adopted by the on-duty level, lean oil premixed combustion is adopted by the main combustion level, and the premixed combustion of a layered part is achieved through coupling of the diffusive combustion and the lean oil premixed combustion. The on-duty level is composed of a centrifugal atomizing nozzle and first level rotational flow air. The fuel oil of the main combustion level is supplied through multi-point direct-injection type nozzles, and oil and air mixing is enhanced through preheating of second level rotational flow air by combination of transverse jet air and on-duty level flame. The on-duty level is used in part-load conditions such as starting and slow operation, a stable combustion range can be broadened, combustion efficiency can be improved, and emission of CO and UHC is lowered; the on-duty level and the main combustion level work at the same time in the heavy load working condition, the on-duty level provides stable ignition sources for the main combustion level, a main combustion area is in a lean oil state, the temperature is far lower than the adiabatic flame temperature, and emission of NOx of high-load conditions can be reduced remarkably.

Description

technical field [0001] The invention relates to a lean premixed low-pollution combustor with a preheating function, in particular to a stratified partial premixed low-pollution combustor which utilizes duty-level preheating to strengthen the mixing of oil and gas in the main fuel stage. Background technique [0002] For gas turbine engines using liquid fuels, fuel atomization and mixing have a decisive impact on engine combustion performance, combustion efficiency and pollutant emissions. Therefore, research on fuel atomization has received attention, which has also promoted the development of fuel atomization nozzles. [0003] The International Civil Aviation Organization's pollutant emission standards for aviation gas turbines are becoming more and more stringent, especially for NOx pollution emission requirements. Low-pollution combustion has become the development trend of modern aero-engine combustors. The requirements of the currently implemented CAEP6 standards are al...

AI Technical Summary

Problems solved by technology

Combustion chambers using lean premixed combustion technology have a longer head premixing section, which is prone to spontaneous combustion or flashback; in addition, compared with traditional oil-rich head combustion chambers, lean premixed combustion chambers have lower critical combustion performance (such as idle poor combustion stability and ignition performance)

Images